This is an On-Board Pressure Gauge that Easily Monitors the Air Pressure of Your Robart Retracts. FEATURES: Works with any air system Mounts to side of fuselage or as an instrument in the cockpit Reads 20-140 psi, in 20 psi increments Metal Construction INCLUDES: One On-Board Pressure Gauge One T-Fitting REQUIRES: Any Pneumatic Retract System. SPECS: Weight: 0.2oz Length: 1-5/8" Diameter: 1/2" JAK 10/28/98 ir/jl